RECIPROCAL TRANSLOCATIONS IN SORGHUM VULGARE

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Abstract
Three reciprocal translocation lines, T165, T231 and T396, were obtained by gamma irradiation of the colchicine-reactive genotype of sorghum (forms true-breeding or nontrue-breeding mutants after colchicine treatment), Experimental 3. In heterozygous plants the percentages of rings and chains respectively at diakinesis for T165 were 56.8% and 38.0%), for T231 were 23.1% and 74.1%, and for T396 were 3.1% and 92.8%. Approximately 50% viable pollen was found in each, indicating that duplications and deficiencies occurred in that frequency. The translocations in T396 involved the nucleolar chromosome. The proportions of ring to chain chromosomes at diakinesis appeared to be related directly to the length of the translocated arms at pachynema and therefore probably to the frequency of chiasmata in the translocation regions. Photographs and measurements of chromosomes in the translocation configurations at pachynema were made for T165 and T231 but since the translocated regions in T396 were short and involved only the very lightly staining euchromatic ends of the chromosomes, it was not possible to study these chromosomes as thoroughly. A common chromosome pair was found in the translocations in T165 and T231 but not in the translocations in T165 and T396 nor in T231 and T396.

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